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Thhn/Thwn Wire

Asked Apr 18, 2008, 07:42 PM — 3 Answers
What's the difference in THHN/THWN besides the W for wet locations. Are these one in the same wire? I see it advertised as such. Sometimes with and with out the THWN part. Just really curious about this

M

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Washington1's Avatar
Washington1 Posts: 800, Reputation: 187
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#2

Apr 19, 2008, 11:23 AM
Quote:
Originally Posted by mr500
Whats the difference in THHN/THWN besides the W for wet locations. Are these one in the same wire? I see it advertised as such. Sometimes with and with out the THWN part. Just really curious about this

M
Hope this helps:


THW-2: Thermoplastic Insulation (usually PVC), Heat Resistant (90
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stanfortyman's Avatar
stanfortyman Posts: 4,886, Reputation: 1326
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#3

Apr 19, 2008, 11:56 AM


As a quick note, yes, today's they are one in the same. You will be hard pressed to find single rated THHN or THWN. Pretty much all THHN is dual rated with THWN.
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mr500's Avatar
mr500 Posts: 181, Reputation: 39
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#4

Apr 19, 2008, 02:18 PM
I was thinking they were the same. BUT I'm going to make cure it reads that on the sheathing I hate to do this twice. BUT I'm sure its all the same with the new stuff out today.

Thanks Been a great help Off to spend that 1.78ft and dive into this stufff!

Mike
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